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8272975: ParallelGC: add documentation to heap memory layout

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Co-authored-by: Thomas Schatzl <tschatzl@openjdk.org>
Reviewed-by: tschatzl, kbarrett
This commit is contained in:
Albert Mingkun Yang 2021-08-26 10:06:38 +00:00
parent b94fd32f08
commit 11c9fd8298
1 changed files with 20 additions and 0 deletions
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20
src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp
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@ -50,6 +50,26 @@ class PSAdaptiveSizePolicy;
class PSCardTable;
class PSHeapSummary;
// ParallelScavengeHeap is the implementation of CollectedHeap for Parallel GC.
//
// The heap is reserved up-front in a single contiguous block, split into two
// parts, the old and young generation. The old generation resides at lower
// addresses, the young generation at higher addresses. The boundary address
// between the generations is fixed. Within a generation, committed memory
// grows towards higher addresses.
//
//
// low high
//
// +-- generation boundary (fixed after startup)
// |
// |<- old gen (reserved) ->|<- young gen (reserved) ->|
// +---------------+--------+-----------------+--------+--------+--------+
// | old | | eden | from | to | |
// | | | | (to) | (from) | |
// +---------------+--------+-----------------+--------+--------+--------+
// |<- committed ->| |<- committed ->|
//
class ParallelScavengeHeap : public CollectedHeap {
friend class VMStructs;
private: